马克思主义历史唯物主义理论认为，（）既是社会大生产的产物，也是先进生产力的代表者。
参考答案：工人阶级
在零售药品中，凭盖有医疗单位公章的医师处方限量供应的是( )
A．一类精神药品B．麻醉药品C．放射性药品D．二类精神药品E．非处方药
Why was my mother disappointed
A．Because I didn’t show her my homework.
B．Because I didn’t show her my homework in time.
C．Because I didn’t do my homework.
D．Because my homework was done poorly.
